Apply juice of crushed fresh cranberries to age spots, and let them dry overnight. Wash off in the morning and note the lighter skin tone.
Or green papaya enzyme, to even out the skin tone and fade brown spots. Apply before retiring for the night; use mild glycolic acid after cleaning, then moisturize.
Or squeaze some fresh lemon juice and apply to darkened spots. It bleaches skin just like it can bleach your hair.